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Maskerade : a novel of Discworld series

There are strange goings-on at the Opera House in Ankh-Morpork. A ghost in a white mask is murdering, well, quite a lot of people, and two witches (it really isn't wise to call them "meddling, interfering old baggages"), or perhaps three, take a hand in unraveling the mystery.

Abstract:

There are strange goings-on at the Opera House in Ankh-Morpork. A ghost in a white mask is murdering, well, quite a lot of people, and two witches (it really isn't wise to call them "meddling, interfering old baggages"), or perhaps three, take a hand in unraveling the mystery.